code: def __call__(self, *args: Expression) -> Expression:
      return self._f(*args)
  
file_path: hail/hail/python/hail/experimental/function.py
imports: from typing import Optional, Tuple, Sequence, Callable
  from hail.expr.expressions import construct_expr, expr_any, unify_all, Expression
  from hail.expr.types import hail_type, HailType
  from hail.ir import Apply, Ref
  from hail.typecheck import typecheck, nullable, tupleof, anytype
  from hail.utils.java import Env
label_desc: Use image node_id 2 for calling the Function obj's underlying member method code with example usage: obj.__call__() and returns: self